SNOWMOBILE SPARK PLUG TIPS

 Spark plugs can be the best indicator that your engine may be developing problems.
 LIGHT BROWN is the correct color around the tip of the plug if your engine is operating in the temperature range it was designed for.
LIGHT IS BAD: If the plug tip is light gray or ash white, your engine is running too hot, light gray indicates the problem has started.  Ash white means the problem is critical and you can burn down or seize your engine. The causes insufficient lubrication, mixture too lean, advanced ignition timing, or wrong spark plug selection.
BLACK TIP PLUGS: Sparkplugs with black tips means the engine is running too cold, and carbon deposits are building up.  The most common causes are too much lubrication, fuel air mixture too rich, wrong plug selection, or a weak or faulty ignition system.